/Engine/Source/Editor/BlueprintGraph/Classes/K2Node_CallFunction.h
Returns the graph for this function, if available. In cases of calling an event, it will be the ubergraph for the event
[UEdGraph](API\Runtime\Engine\EdGraph\UEdGraph) * GetFunctionGraph ( const [UEdGraphNode](API\Runtime\Engine\EdGraph\UEdGraphNode) *& OutGraphNode ) const